Explain why .7x .4= .28 and .6 x .4 = .24, but .2x .3 doesn't equal .6 but .06??
2006-09-19 06:45:05 · 8 answers · asked by grlfrnd1288 2 in Science & Mathematics ➔ Mathematics
thank you, i understand now.
2006-09-19 06:56:27 · update #1
you have to "count the decimals" when you multiply.
In each case you have to move the decimal over twice.
hard to explain without a picture...check out this site...it does make sense when you understand it
http://www.math.com/school/subject1/lessons/S1U1L5GL.html
2006-09-19 06:47:24 · answer #1 · answered by Flower 4 · 1⤊ 0⤋
.7
x .4
=.24
.3
x .2
=.06
You see, because they are decimals, when you multiply them they get smaller. .28 is .7 or 70% of .4. Its a smaller number despite being two digits long, because of the decimal. .6 is not 20% of .3 and therefore cannot be the answer to .2x.3, but instead .06 which is .2 (20%) of .3. It all comes down to decimal places. If you multiple decimals, you have to add toether the amount of places for the product (multiplying two decimals (.2 and .3) means that the decimal place moves 2 places to the left of the product, so 6 becomes .06).
2006-09-19 13:55:48 · answer #2 · answered by shadow_boy42 2 · 0⤊ 0⤋
.2 = 2/10
.3 = 3/10
2/10 x 3/10 = 6/100 = .06
2006-09-19 13:56:17 · answer #3 · answered by WOLFGANG 2 · 0⤊ 0⤋
Try to think of this as fractions.
when you do 0.2 X 0.3 you are acutally looking for 30% of .2
which has to be .06 because .6 is 300%
similary .2 X .5 will be .1 becasue
you are getting half of .2
2006-09-19 13:47:41 · answer #4 · answered by gods_chief_pilot 3 · 0⤊ 0⤋
the 0 takes the place of the 2's
2006-09-19 13:46:29 · answer #5 · answered by Anonymous · 1⤊ 0⤋
When dealing with decimals that have no whole in mulitplication you're taking just a percentage of the other number so the answer can not exceed the origin.
2006-09-19 13:54:29 · answer #6 · answered by zmes_matt 3 · 0⤊ 0⤋
Think about it for a sec. Is 2x3=06 or is 2x3=60? Big difference.
2006-09-19 13:53:35 · answer #7 · answered by Rance D 5 · 0⤊ 0⤋
what?
2006-09-19 13:48:05 · answer #8 · answered by Anonymous · 0⤊ 2⤋